1900.] EROM SINGAPORE AKD MALACCA. 763 



on the females ; but only a few small spots on the meri. In one of 

 the males the spots on the carapace are arranged in pairs, or even in 

 groups of three, giving it a more densely spotted appearance. I 

 may add that I should describe the rostrum, in these individuals, 

 as being distinctly emarginate (vide Alcock, t. c, " rostrum entire 

 or faintly emarginate " ; and Miers, t. c, " front obtuse and rounded 

 or obscurely emarginate "), the emargination taking the form of 

 a wide, triangular notch, quite as distinct as in M. lunar is. Other- 

 wise they entirely agree with Mr. Alcock's description. 



Dim. 6 35x34. d 32x30-5. d 31-75x31. 6 29x23-75. 

 c? 25-5x24-25. $22x21-25. $21-5x20-5. 



100. Mattjta lunaris Herbst. 



? Cancer lunaris, Herbst, Krab. u. Krebse, i. p. 140, pi. vi. f. 44 

 (1790). 



Matuta planipes, Fabr. Suppl. Ent. Syst. p. 369 (1798). 



Cancer lunaris, Herbst, op. cit. iii. p. 43, pi. xlviii. f. 6 (1799). 



Matuta hcnaris, Miers, Trans. Linn. Soc. 2nd ser. Zool. vol. i. 

 p. 247, pi. xl. f. 10 (1877) ; Alcock, Journ. As. Soc. Bengal, 

 vol. lxv. pt. ii. No. 2, pp. 161-2 (1896). 



Sab. Malacca ; littoral. Two young males and a female. 



Dim. d 22-5x21-25. d 16-25x15. $ 20x19. 



LVI. Genus Leucosia Fabr. 



101. Leucosia craniolaris Herbst. 



? Cancer craniolaris, Linn. Syst. Nat. 12th ed. p. 1041 (1766) ; 

 Herbst, Naturgesck. d. Krab. Bd. i. Hft. ii. p. 90, pi. ii. f. 17 

 (1783) ; Fabr. Ent. Syst. ii. p. 441 (1792). 



Leucosia craniolaris, Fabr. Suppl. Ent. Syst. p. 350 (1798); Bell, 

 Trans. Linn. Soc. vol. xxi. p. 283 (1855). 



Leucosia craniolaris, var. Icevimana, Miers, ' Alert ' Crust, p. 250, 

 pi. xxvi. f. A (1884). 



Leucosia craniolaris, Walker, Journ. Linn. Soc, Zool. vol. xx. 

 p. Ill (1887) ; Henderson, Trans. Linn. Soc, Zool. vol. v. p. 397 

 (1893) ; Alcock, Journ. As. Soc. Bengal, vol. lxv. pt. ii. No. 2, 

 p. 231 (1896). 



Bab. Singapore and Malacca ; 5 fms. ; muddy bottom. Two 

 females, of which the larger is from Malacca. 



Dim. $ 19x21-75. $ 14-5x16. 



102. Leucosia rhomboidalis de Haan. 



Leucosia rhomboidalis de Haan, Crust. Japon. p. 134, pi. xxxiii. 

 f. 5 (1839) ; Bell, Trans. Linn. Soc. vol. xxi. p. 284 (1855). 



Leucosia maculata, Stm. Proc Ac. Nat. Sci. Philad. p. 159 (1858). 



Leucosia rhomboidalis, Alcock, Journ. As. Soc. Bengal, vol. lxv. 

 pt. ii. No. 2, p. 234 (1896). 



Hab. Singapore: 5 fms. ; muddy bottom. A male and a female. 



Both these individuals have a row of three yellow spots arranged 



